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Accumulated Other Comprehensive Income (Schedule of Items Reclassified to Statement of Income) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Total pretax amount reclassified | $ (18,393) |  | $ 9,271 |  | $ (36,543) |  | $ (8,488) |
Income tax effect | 7,216 |  | (2,243) |  | 14,673 |  | 4,005 |
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income | (11,219) |  | 7,379 |  | (21,840) |  | (4,132) |
Derivative Valuation Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Payments made on interest rate swaps included in earnings | 473 |  | 454 |  | 951 |  | 910 |
Income tax effect | (184) |  | (177) |  | (371) |  | (354) |
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income | 289 |  | 277 |  | 580 |  | 556 |
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Total pretax amount reclassified | (1,108) |  | (909) |  | (2,217) |  | (1,817) |
Accumulated Defined Benefit Plans Adjustment, Net Transition Asset (Obligation) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Total pretax amount reclassified |  |  | 17 |  |  |  | 34 |
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Total pretax amount reclassified | 1,355 |  | 1,664 |  | 2,683 |  | 3,328 |
Pension and Postretirement Liability Adjustments [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Total pretax amount reclassified | 247 | [1] | 772 | [1] | 466 | [1] | 1,545 | [1]
Income tax effect | (98) |  | (271) |  | (186) |  | (541) |
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income | $ 149 |  | $ 501 |  | $ 280 |  | $ 1,004 |
[1] | These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 4).

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